Machine for sharpening rosk-drills, &amp; c.



No. 659,3 7l. Patented Oct. 9, 1900.

w. E. KIMBER. MACHINE FOB SHABPENING ROGK DBILLS, 8w.

I (Application filed Mar. 3, 1899.) (No Nodl.) I 2 Sheets-Sheet l.

Tn: NORfiIS PEYERS co, Pnorouma. WASHINGTON, n. c.

No. 659,37l. Patentad Oct. 9, 1900.

v w. E. KIMBEB.

MACHINE FOR SHABPENING ROCK DRILLS, 81.0.

(Application filed Mar. 3, 1699.)

(No Model.) 2 Sheets-Shoat 2.-

as jweraz'r M14, J I'E Q9/7662 UNITED STATES PATENT OFFICE.

WVALTER EDWARD KIMBER, JOHANNESBURG, SOUTH AFRICAN REPUBLIC.

MACHINE FOR SHAR'P-ENING ROCK-DRILLS, 84.0.

SPECIFICATION formingpart of Letters Patent No. 659,371, dated October 9, 1900.

Application filed March 3, 1899. Serial No. 707,664. (No model.)

To all whom it may concern.-

Be it known that'I, vWALTER EDWARD KIM- BER, a subject of the Queen of Great Britain, residing at Johannesburg, in the South African Republic, haveinvented certain new and useful Improvements in Machines for Sharpening Rock-Drills, Rock-Drilling-Machin'e Bits, and the Like, (for which I have obtained a patent in the South African Republic, No. 1,742, hearing date September 19, 1898,) of which the following is a specification.

This invention has reference to a machine or apparatus primarily designed for sharpening that class of rock-drilling-machine bits known as star-bits; but it may also be adapted for the purpose of sharpening other classes of rock-drills. It is designed with the object of providing a machine of small dimensions and of simple and compact construction which shall be capable of efficiently and rapidly sharpening the bits without cutting away any portion of the drill-steel, excepting, possibly, in the case of broken or similarlydefective drills.

It consists, essentially, of a machine comprising in its construction a rolling die or a roll provided witha die or impression of the cutting-face of the drill working in conjunction with a holding device or stationary plate in which the bit is secured and the sharpening thereof effected by the die as it is caused to roll backward and forward over the surface of said plate.

The invent-ion will now be particularly described by aid of the accompanying drawings, in which it is illustrated embodied in a machine designed for sharpening star-bits.

In the drawings, Figure 1 shows aside elevation of the machine; Fig. 2, a front elevation with one-half of the stationary plate H removed; Fig. 3, a plan; Fig. 4, a front elevation of the plate Hdetached; Fig. 5, a side elevation of the plate H and rolling-die E, both detached. Fig. 6 shows several views of one of the adjustable holders and centering devices 1" detached. Fig. 7 is a front view of the roll E and its detachable die 6 operating on the end of the drill M, also showing the several holders and centering devices 11 acting in conjunctiontherewith drawn to an enlarged scale. Fig. 8 is a side elevation of Fig.

. screw 6.

7. Fig. 9'is an enlarged view of one of the holders z" from the inside. Fig. 10 is an enlarged view of one of the holders 2" from the outer end.

,The frame of the machine consists of a base or bed plate A and the two vertical members or sides a 01.,located at one end thereof.

B is a driving-shaft mounted in bearings vertical recesses, in which blocks or slides b b are arranged in such a way as to be capable of sliding freely up and down therein. b shows liners fitted within these recesses.

, E is a roll fitted with a preferably-detachable die 6, corresponding to the cutting-face of the drill, secured to the roll by means of (See Fig. 5.) As constructed for effecting the sharpening of .star-bits the detachable die (2 takes the form of two V-shaped grooves 6 6 cut in and around the periphery or surface of the roll and intersecting at the center in the form of the letter X, as seen more particularly in Figs. 2 and 7. As the roll is rotated over the face of the drill the wings or webs are beveled off on opposite sides, thus forming a V-shaped edge thereon. As illustrated in Figs. 2 and 7, the grooves e 2 constituting the die or cress, are produced beyond the edges of the detachable die to accommodate stops it on the holders 2' when a wider range of adjustment is necessary than is possible within the limits of the grooves e e in the die 6 to permit of a wider range of adjustment being effected. The reduced ends of the roll E project through the slides b b to the outside ofthe parts a a, of the frame.

F is a connecting-rod from the drivingshaft B. The connecting-rod F is bifurcated or formed with two depending arms f f, which at their lower extremities loosely embrace the reduced ends of the roll E between the sides a a of the frame or to the inside of the slides b b. By this construction the roll E can rotate independently as it is raised and lowered by the connecting-rod F on the rotation of the driving-shaft l3.

G G are plates secured to the outside of the vertical members a a of the frame. The plates G G are formed with an open center and are constructed on the front inner vertical edge with a rack or teeth g. On the reduced ends of the roll E, which project beyond the sides a a into the open center of the plates G G, are keyed or otherwise secured pinions h, which gear with the teeth or stationary racks g. By this means the roll E is also rotated as it is raised or lowered, the direction of. rotation of the roll being reversed on the upward and downward movement.

H is the stationary plate in which the drills are held while being sharpened by the rolling die E as it is rotated over its surface, the plate also acting as a centering device for the drills while under operation. The plate is arranged immediately in front of the roll E and transversely of the frame and secured to the vertical members a. a. It is formed with a central circular hole iand with four radial slots in which the four holding and centering devices i see more particularly Figs. 4 and (1) are arranged. The holding devices are formed with an enlargement or shoulder i on two opposite sides, (see Figs. 6, 9, and 10,) and the outer or front face of the plate H is countersunk to correspond along the edges of the radial slots, so as to bring the face i of the holders level with the surface of the plate H at the back.

J is a disk arranged over the front of the plate H. This disk is constructed with a central hole corresponding to the hole 2' in the plate H and with four curved eccentricallydisposed slots into which small projections or pinsj, formed on the holders z", project. As the disk J is rotated in one direction the several holders are simultaneously forced inward and are expanded or opened when the disk is rotated in the opposite direction.

K is a lever for operating the disk J, to which it is attached, to adjust the holding devices or to close them on the drill when it is placed in position between them.

L is a cap or cover secured to the plate H for holding the several parts in position.

The holding and centering devices 1" are formed hollow or concave at their extremities to correspond to the convexity of the tips or outer edges of the Wings of the sharpened or finished drill. The holders 2" are each constructed with a projection or stop 70, which projects beyond the surface of the plate H at the back and enters the die 6 as it rotates over the plate to prevent the metal of the drill being rolled beyond the desired point or over the surface of the plate H. The stops 7c of the holders 1), as seen more particularly in Figs. 6, 9, and 10, are of V shape, corresponding to the V-shaped grooves 6 a constituting the cress or die 6. When the holders are acting to hold and center the drill while being sharpened, the stops enter or penet rate and fill or close up the grooves c c, and thus prevent the metal of the drill being rolled beyond them. As seen in Fig. 9, the stops 7c are also formed concave at the outer end, so as to impart the desired rotundity to the tips of the wings or webs of the drill. The roll E is shown in dotted lines in Fig. 8 in both the upper and lower positions, where the V-shaped stops k penetrate the V-shaped grooves e e of the die, so as to prevent the metal being rolled beyond the tips of the drill within the grooves or over the surface of the plate H. The adjustability of the centering and holding device enables drills of varying sizes to be sharpened by the one machine.

L is a bar arranged to slide in guides Z Z formed on the base-plate A in front of the machine. The bar is provided with a number of holes 1 in which fits a stop 1 formed with a cavity or recess for the shank of the drill M while being sharpened. At the front end the bar L is fitted with a nut m, traversed bya screw m, supported bya bracket m secured to the base-plate A.

N is a further bracket fixed to the baseplate A and formed with a boss n, in which rotates a spindle fitted with a bevel-wheel n at one end and an operating-handle n at the other. The bevel-wheel n gears with a bevel- Wheel n fixed to the extremity of the screw m beyond the bracket 077?.

In operation the drill to be sharpened, having first been heated, is placed with its cutting extremity projecting through the plate H and bearing against the die 6 in the roll E,

the stop Z being placed in position to support the drill endwise. The handle K is rotated to close the holders 1." on the tips or outer edges of the wings of the drill and motion then imparted to the machine. As the roll E is rapidly rotated over the surface of the plate H the cutting face or edges of the drill are sharpened by being rolled to the desired shape, the screw on being operated by the handle 11 to feed the drill forward during the operation.

I will here remark that the only alterations necessary in adapting the machine for the sharpening of drills of other shapes, such as chisel bits or drills of triangular or other section, will consist of the requisite variations in the formation of the rolling die to correspond to the cutting-face of the drill and in the construction of the holding device or stationary plate, in conjunction with which the rolling die works, to correspond to the shape of the cutting extremity.

Having now described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. A machine for sharpening rock-drills,

rock-drilling-machine bits and the like, constructed with a sharpening tool or die corresponding to the cutting-face of the drill, said sharpening-die being sunk on a curved surface or formed with a rounded or curved working face adapted to roll or rotate over the cutting-face of the drill or tool to be sharpened. I

2. In a machine for sharpening rock-drills, the combination with a sharpening tool'or die sunk on a circular or curved surface or with a rounded or circular working face corresponding to the cutting-face of the drill and means for holding and centering the drill or maintaining the cutting-face thereof coincident with the sharpening-die substantially as described.

3. In a machine for sharpening star-bits, the combination with a sharpening-die, consisting of two intersecting V-shaped grooves cut in a rounded or curved surface and constituting a circular or curved working face therefor corresponding to' the cutting-face on the extremity of the drillsaid die being adapted to be rolled over the cutting-face of the drill, of means for obtaining due coincidence of the sharpening-die and the cutting-face of the drill and,forsupportingthe drill endwise and feeding it forward to the die as the sharp eniug proceeds substantially as described.

4. A machine for sharpening rock-drills and rock-dfilling-machine bits constructed with a roll carryinga die or impression of the cutting-face .of the drill on the extremities of which roll pinions are secured which gear into fixed racks to rotate the roll as it is reciprocated and a stationary plate arranged in front of the roll in which the drill is centered and held while being sharpened, substantially as described. i

5. A machine for sharpening rock-drills and rock-drilling-machine bits comprising a roll carrying a die or impression of the cuttingfaee of the drill, pinions fixed to the extremities of said roll, stationary racks into which the pinions gear to effect a positive rotation of the roll as it is reciprocated, a stationary plate fitted with adjustable holding and centering devices arranged in front of the roll in which the drill is secured during the sharpenin g process, substantially as described.

6. In a machine for sharpening rock-drills and rock-drilling-machine bits, in combination, the roll E, the pinions h fixed to the ends of the roll, the plates G G formed with an open center and provided with teeth 9 on their front inner vertical edges with which the pinions mesh or gear to rotate the roll as it is reciprocated, the stationary plate H provided with adjustable holding and centering devices and a means for reciprocating the roll E over the surface of plate H, substantially as described.

7. In a machine for sharpening rock-drills and rock-drilling-machine bits, in combination, the roll E, carrying a die or impression of the cutting-face of the drill, the pinions h fixed to the extremities thereof, the plates G G open at the center and constructed with a rack or teeth g on their inner front vertical edge into which the pinions h gear, the stationary plate H formed with a central opening for the drill and with a number of radial slots corresponding to the wings of the drill, the centering and holding devices 71 titted within saidslots and capable of being moved to or'from the center of the aperture in the plate H, means for reciprocating the roll over the'surface of plate H and an arrangement for supporting the drill end wise and feeding it forward while being sharpened, substantially as described.

8. In a machine for sharpening rock-drills and rock-drilling-machine bits the arrangement for centering and holding the drills comprising, in combination, the stationary plate H formed with a central aperture or opening 1; for the drill and with-a number of radial slots recessed or countersunk along the radial edges, corresponding in number to the wings of the drill and opening into the central aperture 2', the holders and centering devices 11' fitted within the radial slots and formed with shoulders 2' on two opposite sides to fit the recessed or countersunk radial edges of the slots, and constructed hollow or con cave at their extremities to correspond-to the convexity of the tips orouter edges of the wings of the finished drill, the projections 75 formed on the extremities of the holders 2" and projecting beyond the surface of the plate H at the back to prevent the metal of the drill being rolled beyond the desired point, the pins or projectionsjformed on the holders t" on the inside, the disk J provided with a number of curved eccentrically-disposed slots corresponding to the holders t" the lever K attached to the disk J for rotating it in either direction and the cap or cover L attached to the plate H for holding the several parts in position, substantially as described. 1

9. In'a machine for sharpening rock-drills and rock-drilling-machine bits, in combination, the frame comprising the base-plate A and vertical sides a a, the vertical recesses formed in the sides a a, the blocks or slides b b fitted therein, the roll E, carrying a die or impression of the cutting-face of the drill,

blocks 19 b to the outside of the sides a a, the plates G G, secured to the vertical members a a, on the outside, formed with an open center and with teeth g on the inner front vertical edge, the pinions h fixed to the ends of the roll within the plates G G and gearing the racks g, the stationary plate H secured to the sides a a in front of the roll E, the holding and centering devices t" arranged to slide in radial slots formed in the plate H, the projections 7c and pins j formed on the holders t", the disk J formed with eccentric slots into which the pins j project, the lever K, cap or cover L and means for reciprocating the roll E over the surface of the plate H, and an arrangement for supporting the into which the projections or pins j project,

with its extremities projecting through the drill endwise and feeding the same forward during the operation of sharpening, substantially as described and shown.

10. In combination the frame comprising the base-plate A and vertical sides a a, the driving-shaft B mounted in bearings in the upper ends of the sides a a, the fly-wheels O C, the fast and loose pulleys D D, the vertical recesses formed in the sides a a, the blocks 1) 1) arranged to slide therein, the liners b the roll E, fitted with a detachable die e corresponding to the cutting-face of the drill to be sharpened and with its extremities projecting through the blocks 1) b to the outside of the sides a a, the connecting-rod F formed with two arms f f loosely embracing the turned-downends of the roll E to the inside of the blocks l) b, the plates G G fixed to the outside of the vertical members a a and constructed with an open center, the rack or teeth 9 formed on the inner front vertical edge thereof, the stationary plate H arranged in front of the roll E and secured to the sides a a formed with a central aperture or opening for the drill and with a number of radial slots recessed or countersunk along the radial edges, corresponding in number to the wings of the drill and opening into the central aperture 2', the holders and centering devices 7," fitted within the radial slots and formed with shoulders on two opposite sides to fit the recessed or countersunk radial edges of the slots, and constructed hollow or concave at their extremities to correspond to the convexity of the tips or outer edges of the Wings of the finished drill, the projections k formed on the extremities of the holders z" and projecting beyond the surface of the plate H at the back to prevent the metal of the drill being rolled beyond the desired point, the pins or projectionsj formed on the holders 11 on the inside, the disk J provided with a number of curved eccentrically disposed slots corresponding to the holders 1" into which the projections or pinsj project, the lever K attached to the disk J for rotating it in either direction and the cap or cover L attached to the plate H for holding the several parts in position, the guides Z Z formed on the base-plate A, the bar L formed with the holes Z the stop Z, for the shank of the drill, the nut m fitted in the forward end of the bar L, the screw m traversing the nut m, the bracket m supporting the other extremity of the screw m, the bevel-wheel of secured to the end of screw m beyond bracket m the bracket N fixed to the base-plate A formed with boss n, the spindle rotating in the boss n, the handle 11* connected to one end thereof and the bevel-wheel n connected to the other extremity, the bevelwheel n gearing bevel-wheel n for supporting the drill endwise and feeding the drill forward while being sharpened, substantially as described and shown.

In witness whereof I have hereunto set my hand in presence of two witnesses.

WALTER EDWARD KIMBER. Witnesses:

CHAS. OVENDALE, G. I. FISCHER. 

